Title: Evaluation of the interactive stratospheric ozone (O3v2) module in the E3SM version 1 Earth system model

Abstract

Stratospheric ozone affects climate directly as the predominant heat source in the stratosphere and indirectly through chemical reactions controlling other greenhouse gases. The U.S. Department of Energy's Energy Exascale Earth System Model version 1 (E3SMv1) implemented a new ozone chemistry module that improves the simulation of the sharp tropopause gradients, replacing a version based partly on long-term average climatologies that poorly represented heating rates in the lowermost stratosphere. The new O3v2 module extends seamlessly into the troposphere and preserves the naturally sharp cross-tropopause gradient, with 20 %–40 % less ozone in this region. Additionally, O3v2 enables the diagnosis of stratosphere–troposphere exchange flux of ozone, a key budget term lacking in E3SMv1. Here, we evaluate key features in ozone abundance and other closely related quantities in atmosphere-only E3SMv1 simulations driven by observed sea surface temperatures (SSTs, years 1990–2014), comparing them with satellite observations of ozone and also with the University of California, Irvine chemistry transport model (UCI CTM) using the same stratospheric chemistry scheme but driven by European Centre forecast fields for the same period. In terms of stratospheric column ozone, O3v2 shows reduced mean bias and improved northern midlatitude variability, but it is not quite as good as the UCI CTM.more » As expected, SST-forced E3SMv1 simulations cannot synchronize with observed quasi-biennial oscillations (QBOs), but they do show the typical QBO pattern seen in column ozone. This new O3v2 E3SMv1 model mostly retains the same climate state and climate sensitivity as the previous version, and we recommend its use for other climate models that still use ozone climatologies.« less

Authors:

Tang, Qi  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-2959-0203"

Prather, Michael J.  ^[2];

• Search DOE PAGES for author "Prather, Michael J."
• Search DOE PAGES for ORCID "0000-0002-9442-8109"

Hsu, Juno  ^[2];

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• Search DOE PAGES for ORCID "0000-0002-4803-3202"

Ruiz, Daniel J. ^[2]; Cameron-Smith, Philip J.  ^[1];

• Search DOE PAGES for author "Cameron-Smith, Philip J."
• Search DOE PAGES for ORCID "0000-0002-8802-8627"

Xie, Shaocheng ^[1]; Golaz, Jean-Christophe  ^[1]

• Search DOE PAGES for author "Golaz, Jean-Christophe"
• Search DOE PAGES for ORCID "0000-0003-1616-5435"

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+ Show Author Affiliations

1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
2. Univ. of California, Irvine, CA (United States)

Publication Date:

Fri Mar 05 00:00:00 EST 2021

Research Org.:

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER); National Aeronautics and Space Administration (NASA)

OSTI Identifier:

1769122

Report Number(s):

LLNL-JRNL-813913
Journal ID: ISSN 1991-9603; 1022252

Grant/Contract Number:  

AC52-07NA27344; AC02-05CH11231; AC05-76RL01830; 80NSSC20K1237

Resource Type:

Accepted Manuscript

Journal Name:

Geoscientific Model Development (Online)

Additional Journal Information:

Journal Name: Geoscientific Model Development (Online); Journal Volume: 14; Journal Issue: 3; Journal ID: ISSN 1991-9603

Publisher:

Copernicus Publications, EGU

Country of Publication:

United States

Language:

English

Subject:

54 ENVIRONMENTAL SCIENCES